/*
 * RequestManager.h
 *
 * Copyright (C) 2008 Matthias Schiffer <matthias@gamezock.de>
 *
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef MAD_COMMON_REQUESTMANAGER_H_
#define MAD_COMMON_REQUESTMANAGER_H_

#include "Request.h"

#include <map>
#include <memory>
#include <string>

#include <boost/thread/locks.hpp>
#include <boost/thread/shared_mutex.hpp>

namespace Mad {

namespace Net {
class Packet;
}

namespace Common {

class RequestManager : boost::noncopyable {
  private:
    class RequestMap : private std::map<boost::uint16_t, boost::shared_ptr<RequestHandler> >, boost::noncopyable {
      public:
        bool addRequest(boost::uint16_t id, boost::shared_ptr<RequestHandler> info);
        boost::shared_ptr<RequestHandler> findRequest(boost::uint16_t id);
        bool deleteRequest(boost::uint16_t id);
    };

    class RequestHandlerFactory {
      protected:
        RequestHandlerFactory() {}

      public:
        virtual boost::shared_ptr<RequestHandler> createRequestHandler(Connection *connection, boost::uint16_t requestId) = 0;
        virtual ~RequestHandlerFactory() {}
    };

    template<class T> class SpecificRequestHandlerFactory : public RequestHandlerFactory {
      public:
        virtual boost::shared_ptr<RequestHandler> createRequestHandler(Connection *connection, boost::uint16_t requestId) {
          return boost::shared_ptr<RequestHandler>(new T(connection, requestId));
        }
    };

    static RequestManager requestManager;

    boost::shared_mutex mutex;

    std::map<Connection*, boost::shared_ptr<RequestMap> > requestMaps;
    bool server;
    boost::uint16_t lastRequestId;

    std::map<std::string, boost::shared_ptr<RequestHandlerFactory> > requestHandlerFactories;

    boost::uint16_t _getRequestId() {
      return lastRequestId+=2;
    }

    void receiveHandler(Connection *connection, const XmlPacket &packet, boost::uint16_t requestId);

    boost::shared_ptr<RequestMap> _getUnusedRequestId(Connection *connection, boost::uint16_t *requestId);

    bool send(Request *request);

    RequestManager();

  public:
    static RequestManager* get() {
      return &requestManager;
    }

    bool isServer() {
      boost::shared_lock<boost::shared_mutex> lock(mutex);
      return server;
    }

    void setServer(bool newServer) {
      boost::lock_guard<boost::shared_mutex> lock(mutex);

      server = newServer;

      if(server)
        lastRequestId &= ~0x01;
      else
        lastRequestId |= 0x01;
    }

    void registerConnection(Connection *connection);

    void unregisterConnection(Connection *connection) {
      boost::lock_guard<boost::shared_mutex> lock(mutex);
      requestMaps.erase(connection);
    }

    template <class T> void registerPacketType(const std::string &type) {
      boost::lock_guard<boost::shared_mutex> lock(mutex);
      requestHandlerFactories.insert(std::make_pair(type, boost::shared_ptr<SpecificRequestHandlerFactory<T> >(new SpecificRequestHandlerFactory<T>())));
    }

    void unregisterPacketType(const std::string &type) {
      boost::lock_guard<boost::shared_mutex> lock(mutex);
      requestHandlerFactories.erase(type);
    }

    template <class T>
    bool sendRequest(Connection *connection, Request::slot_type slot) {
      boost::unique_lock<boost::shared_mutex> lock(mutex);

      boost::shared_ptr<RequestMap> requestMap;
      boost::uint16_t requestId;

      requestMap = _getUnusedRequestId(connection, &requestId);

      if(!requestMap)
        return false;

      boost::shared_ptr<Request> request(new T(connection, requestId, slot));
      requestMap->addRequest(requestId, request);
      lock.unlock();

      request->sendRequest();

      return true;
    }

    template <class T, typename T1>
    bool sendRequest(Connection *connection, Request::slot_type slot, T1 t1) {
      boost::unique_lock<boost::shared_mutex> lock(mutex);

      boost::shared_ptr<RequestMap> requestMap;
      boost::uint16_t requestId;

      requestMap = _getUnusedRequestId(connection, &requestId);

      if(!requestMap)
        return false;

      boost::shared_ptr<Request> request(new T(connection, requestId, slot, t1));
      requestMap->addRequest(requestId, request);
      lock.unlock();

      request->sendRequest();

      return true;
    }

    template <class T, typename T1, typename T2>
    bool sendRequest(Connection *connection, Request::slot_type slot, T1 t1, T2 t2) {
      boost::unique_lock<boost::shared_mutex> lock(mutex);

      boost::shared_ptr<RequestMap> requestMap;
      boost::uint16_t requestId;

      requestMap = _getUnusedRequestId(connection, &requestId);

      if(!requestMap)
        return false;

      boost::shared_ptr<Request> request(new T(connection, requestId, slot, t1, t2));
      requestMap->addRequest(requestId, request);
      lock.unlock();

      request->sendRequest();

      return true;
    }

    template <class T, typename T1, typename T2, typename T3>
    bool sendRequest(Connection *connection, Request::slot_type slot, T1 t1, T2 t2, T3 t3) {
      boost::unique_lock<boost::shared_mutex> lock(mutex);

      boost::shared_ptr<RequestMap> requestMap;
      boost::uint16_t requestId;

      requestMap = _getUnusedRequestId(connection, &requestId);

      if(!requestMap)
        return false;

      boost::shared_ptr<T> request(new T(connection, requestId, slot, t1, t2, t3));
      requestMap->addRequest(requestId, request);
      lock.unlock();

      request->sendRequest();

      return true;
    }

    template <class T, typename T1, typename T2, typename T3, typename T4>
    bool sendRequest(Connection *connection, Request::slot_type slot, T1 t1, T2 t2, T3 t3, T4 t4) {
      boost::unique_lock<boost::shared_mutex> lock(mutex);

      boost::shared_ptr<RequestMap> requestMap;
      boost::uint16_t requestId;

      requestMap = _getUnusedRequestId(connection, &requestId);

      if(!requestMap)
        return false;

      boost::shared_ptr<Request> request(new T(connection, requestId, slot, t1, t2, t3, t4));
      requestMap->addRequest(requestId, request);
      lock.unlock();

      request->sendRequest();

      return true;
    }
};

}
}

#endif /* MAD_COMMON_REQUESTMANAGER_H_ */